Hi all. Any advice?

There is one player that I come up against that I do not know how to handle. He is a notorious flush and straight chaser but also a hell of a bluffer. He will stay in pots without the correct drawing odds hoping to hit, usually on the river. But he will also play hoping for a bluffing opportunity, even with no hand, ie if a flush or straight card falls, he'll go all in. Sometimes he'll have it, other times he won't.

How do you read such a player?